ERDDAP > info > bcodmo_dataset_770864

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
	set	data	graph		files	public	Underway pCO2 from the R/V Pelican cruise GOM_UW_1704 conducted in the Northern Gulf of Mexico in April 2017.		I   M	background			BCO-DMO	bcodmo_dataset_770864

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	access_formats	String	.htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt
attribute	NC_GLOBAL	acquisition_description	String	Underway sea surface temperature, salinity, and pCO2 data were collected continuously along the cruise track. Surface seawater was collected from an intake on the port side of the ship at about 4m depth. SST and SSS were measured by an SBE45 (Sea-Bird Electronics) Thermosalino graph installed in the sea chest. Seawater was pumped to the ship's labs. There, underway pCO2 was measured inline by an automated system (Apollo Scitech) with a Li-7000 (LICOR, Inc.) non-dispersive infrared detector at a water flow rate of 3-4L/min; The sampling interval was 2 min. This autonomous system was twice daily against three certified CO2 gas standards (150.62, 404.72, and 992.54 ppm) obtained from NOAA's Earth System Research Laboratory (ESRL), Global Monitoring Division in Boulder, CO. These gas standards are directly traceable to the World Meteorological Organization (WMO) scale. The precision of underway pCO2 measurements of this system is 0.1 \u03bcatm, and the overall accuracy is estimated at 2 \u03bcatm, as documented by Pierrot et al. (2009). The underway system uses a shower head type equilibrator with ~0.5L headspace volume. Instruments: Underway pCO2 was measured inline by an automated system (Apollo Scitech) with a Li-7000 (LICOR, Inc.) non-dispersive infrared detector . The pCO2 measurement was calibrated twice daily against 3 certified CO2 gas standards (150.62, 404.72, and 992.54 ppm)
attribute	NC_GLOBAL	awards_0_award_nid	String	751331
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-1559279
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1559279
attribute	NC_GLOBAL	awards_0_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_0_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_0_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_0_program_manager	String	Henrietta N Edmonds
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	51517
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	underway pCO2 PI: Wei-Jun Cai data version: 1 (2019-07-01)
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	info at bco-dmo.org
attribute	NC_GLOBAL	creator_name	String	BCO-DMO
attribute	NC_GLOBAL	creator_type	String	institution
attribute	NC_GLOBAL	creator_url	String	https://www.bco-dmo.org/
attribute	NC_GLOBAL	data_source	String	extract_data_as_tsv version 2.3 19 Dec 2019
attribute	NC_GLOBAL	date_created	String	2019-06-18T20:26:55Z
attribute	NC_GLOBAL	date_modified	String	2019-07-10T20:09:46Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.770864.1
attribute	NC_GLOBAL	Easternmost_Easting	double	-88.7984
attribute	NC_GLOBAL	geospatial_lat_max	double	29.6455
attribute	NC_GLOBAL	geospatial_lat_min	double	27.4902
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-88.7984
attribute	NC_GLOBAL	geospatial_lon_min	double	-93.4223
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/770864
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	LI-COR LI-7000
attribute	NC_GLOBAL	instruments_0_dataset_instrument_description	String	Underway pCO2 was measured inline by an automated system (Apollo Scitech) with a Li-7000 (LICOR, Inc.) non-dispersive infrared detector .
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	770878
attribute	NC_GLOBAL	instruments_0_description	String	The LI-7000 CO2/H2O Gas Analyzer is a high performance, dual cell, differential gas analyzer. It was designed to expand on the capabilities of the LI-6262 CO2/ H2O Gas Analyzer. A dichroic beam splitter at the end of the optical path provides radiation to two separate detectors, one filtered to detect radiation absorption of CO2 and the other to detect absorption by H2O. The two separate detectors measure infrared absorption by CO2 and H2O in the same gas stream. The LI-7000 CO2/ H2O Gas Analyzer is a differential analyzer, in which a known concentration (which can be zero) gas is put in the reference cell, and an unknown gas is put in the sample cell.
attribute	NC_GLOBAL	instruments_0_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/382/
attribute	NC_GLOBAL	instruments_0_instrument_name	String	LI-COR LI-7000 Gas Analyzer
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	577
attribute	NC_GLOBAL	instruments_0_supplied_name	String	a Li-7000 (LICOR, Inc.) non-dispersive infrared detector
attribute	NC_GLOBAL	instruments_1_acronym	String	pCO2 Sensor
attribute	NC_GLOBAL	instruments_1_dataset_instrument_description	String	Underway pCO2 was measured inline by an automated system (Apollo Scitech) with a Li-7000 (LICOR, Inc.) non-dispersive infrared detector .
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	770877
attribute	NC_GLOBAL	instruments_1_description	String	A sensor that measures the partial pressure of CO2 in water (pCO2)
attribute	NC_GLOBAL	instruments_1_instrument_name	String	pCO2 Sensor
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	676
attribute	NC_GLOBAL	instruments_2_acronym	String	SBE 45 MicroTSG
attribute	NC_GLOBAL	instruments_2_dataset_instrument_nid	String	770876
attribute	NC_GLOBAL	instruments_2_description	String	A small externally powered, high-accuracy instrument, designed for shipboard determination of sea surface (pumped-water) conductivity and temperature. It is constructed of plastic and titanium to ensure long life with minimum maintenance. It may optionally be interfaced to an external SBE 38 hull temperature sensor. Sea Bird SBE 45 MicroTSG (Thermosalinograph)
attribute	NC_GLOBAL	instruments_2_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L22/current/TOOL0190/
attribute	NC_GLOBAL	instruments_2_instrument_name	String	Sea-Bird SBE 45 MicroTSG Thermosalinograph
attribute	NC_GLOBAL	instruments_2_instrument_nid	String	528063
attribute	NC_GLOBAL	instruments_2_supplied_name	String	SBE45 (Sea-Bird Electronics) Thermosalino graph
attribute	NC_GLOBAL	keywords	String	bco, bco-dmo, biological, carbon, carbon dioxide, chemical, co2, cruise, data, dataset, date, density, dioxide, dmo, earth, Earth Science > Oceans > Salinity/Density > Salinity, erddap, flag, Flag_pCO2, global, gps, latitude, longitude, management, ocean, oceanography, oceans, office, pCO2, positioning, practical, preliminary, region, salinity, science, sea, sea_water_practical_salinity, seawater, system, temperature, time, water
attribute	NC_GLOBAL	keywords_vocabulary	String	GCMD Science Keywords
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/770864/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/770864
attribute	NC_GLOBAL	Northernmost_Northing	double	29.6455
attribute	NC_GLOBAL	param_mapping	String	{'770864': {'Latitude': 'flag - latitude', 'GPS_DateTime_UTC': 'flag - time', 'Longitude': 'flag - longitude'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/770864/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	University of Delaware
attribute	NC_GLOBAL	people_0_person_name	String	Wei-Jun Cai
attribute	NC_GLOBAL	people_0_person_nid	String	528011
attribute	NC_GLOBAL	people_0_role	String	Principal Investigator
attribute	NC_GLOBAL	people_0_role_type	String	originator
attribute	NC_GLOBAL	people_1_affiliation	String	Dalhousie University
attribute	NC_GLOBAL	people_1_person_name	String	Katja Fennel
attribute	NC_GLOBAL	people_1_person_nid	String	50705
attribute	NC_GLOBAL	people_1_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_1_role_type	String	originator
attribute	NC_GLOBAL	people_2_affiliation	String	Louisiana State University
attribute	NC_GLOBAL	people_2_affiliation_acronym	String	LSU
attribute	NC_GLOBAL	people_2_person_name	String	Nancy Rabalais
attribute	NC_GLOBAL	people_2_person_nid	String	751342
attribute	NC_GLOBAL	people_2_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_2_role_type	String	originator
attribute	NC_GLOBAL	people_3_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_3_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_3_person_name	String	Karen Soenen
attribute	NC_GLOBAL	people_3_person_nid	String	748773
attribute	NC_GLOBAL	people_3_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_3_role_type	String	related
attribute	NC_GLOBAL	project	String	nGOMx acidification
attribute	NC_GLOBAL	projects_0_acronym	String	nGOMx acidification
attribute	NC_GLOBAL	projects_0_description	String	NSF Award Abstract: Ocean acidification (OA) refers to the lowering of ocean pH (or increasing acidity) due to uptake of atmospheric carbon dioxide (CO2). A great deal of research has been done to understand how the open ocean is influenced by OA, but coastal systems have received little attention. In the northern Gulf of Mexico (nGOM) shelf region, pH in bottom waters can measure up to 0.45 units less than the pH of the pre-industrial surface ocean, in comparison to the 0.1 overall pH decrease across the entire ocean. Carbonate chemistry in the ocean is greatly influenced by even small changes in pH, so these seemingly minor changes lead to much greater impacts on the biology and chemistry of the ocean. The researchers plan to study coastal OA in the nGOM, a region subject to high inputs of nutrients from the Mississippi River. These inputs of anthropogenic nitrogen mostly derived from fertilizers leads to increased respiration rates which decreases oxygen concentrations in the water column to the point of hypoxia in the summer. This study will inform us how OA in coastal waters subject to eutrophication and hypoxia will impact the chemistry and biology of the region. The researchers are dedicated to outreach programs in the Gulf and east coast regions, interacting with K-12 students and teachers, undergraduate/graduate student training, and various outreach efforts (family workshops on OA, lectures for the public and federal, state, and local representatives). Also, a project website will be created to disseminate the research results to a wider audience. Increased uptakes of atmospheric carbon dioxide (CO2) by the ocean has led to a 0.1 unit decrease in seawater pH and carbonate mineral saturation state, a process known as Ocean Acidification (OA), which threatens the heath of marine organisms, alters marine ecosystems, and biogeochemical processes. Considerable attention has been focused on understanding the impact of OA on the open ocean but less attention has been given to coastal regions. Recent studies indicate that pH in bottom waters of the northern Gulf of Mexico (nGOM) shelf can be as much as 0.45 units lower relative to pre-industrial values. This occurs because the acidification resulting from increased CO2 inputs (both atmospheric inputs and in-situ respiration) decreases the buffering capacity of seawater. This interactive effect will increase with time, decreasing summertime nGOM bottom-water pH by an estimated 0.85 units and driving carbonate minerals to undersaturation by the end of this century. Researchers from the University of Delaware and the Louisiana Universities Marine Consortium will carry out a combined field, laboratory, and modeling program to address the following questions. (1) What are the physical, chemical, and biological controls on acidification in coastal waters impacted by the large, nutrient-laden Mississippi River?; (2) What is the link between coastal-water acidification, eutrophication, and hypoxia; (3) How do low pH and high CO2 concentrations in bottom waters affect CO2 out-gassing during fall and winter and storm periods when the water column is mixed?; and (4) What are the influences of changing river inputs under anthropogenic forcing on coastal water acidification? Results from this research aim to further our understanding of the processes influencing ocean acidification in coastal waters subject to eutrophication and hypoxia both in the GOM and river-dominated shelf ecosystems globally.
attribute	NC_GLOBAL	projects_0_end_date	String	2019-04
attribute	NC_GLOBAL	projects_0_geolocation	String	northern Gulf of Mexico, 27.5 N, 30 N, 88 W, 94 W
attribute	NC_GLOBAL	projects_0_name	String	Collaborative Research: pH Dynamics and Interactive Effects of Multiple Processes in a River-Dominated Eutrophic Coastal Ocean
attribute	NC_GLOBAL	projects_0_project_nid	String	751332
attribute	NC_GLOBAL	projects_0_start_date	String	2016-05
attribute	NC_GLOBAL	publisher_name	String	Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute	NC_GLOBAL	publisher_type	String	institution
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	27.4902
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	subsetVariables	String	Cruise,Flag_pCO2
attribute	NC_GLOBAL	summary	String	Underway pCO2 from R/V Pelican cruise conducted in the northern Gulf of Mexico (27.5 N, 30 N, 88 W, 94 W) from April 5th to 16th in 2017. The precision of pCO2 is \u00b12 \u00b5atm.
attribute	NC_GLOBAL	time_coverage_end	String	2017-04-16T20:54:39Z
attribute	NC_GLOBAL	time_coverage_start	String	2017-04-06T13:07:17Z
attribute	NC_GLOBAL	title	String	Underway pCO2 from the R/V Pelican cruise GOM_UW_1704 conducted in the Northern Gulf of Mexico in April 2017.
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	Westernmost_Easting	double	-93.4223
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	Region		String
attribute	Region	bcodmo_name	String	region
attribute	Region	description	String	Study area: MisPlume (west), MisPlume (east), AtchCoast or AtchPlume
attribute	Region	long_name	String	Region
attribute	Region	units	String	unitless
variable	Cruise		String
attribute	Cruise	bcodmo_name	String	Cruise Name
attribute	Cruise	description	String	Cruise name
attribute	Cruise	long_name	String	Cruise
attribute	Cruise	units	String	unitless
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.491484037E9, 1.492376079E9
attribute	time	axis	String	T
attribute	time	bcodmo_name	String	ISO_DateTime_UTC
attribute	time	description	String	Date time in format yyyy-mm-ddTHH:MM:SS (UTC)
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	GPS Date Time UTC
attribute	time	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/
attribute	time	source_name	String	GPS_DateTime_UTC
attribute	time	standard_name	String	time
attribute	time	time_origin	String	01-JAN-1970 00:00:00
attribute	time	time_precision	String	1970-01-01T00:00:00Z
attribute	time	units	String	seconds since 1970-01-01T00:00:00Z
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	_FillValue	double	NaN
attribute	longitude	actual_range	double	-93.4223, -88.7984
attribute	longitude	axis	String	X
attribute	longitude	bcodmo_name	String	longitude
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	description	String	Longitude, west is negative
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/LONX/
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	NaN
attribute	latitude	actual_range	double	27.4902, 29.6455
attribute	latitude	axis	String	Y
attribute	latitude	bcodmo_name	String	latitude
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	description	String	Latitude, south is negative
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/LATX/
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
variable	Temperature		float
attribute	Temperature	_FillValue	float	NaN
attribute	Temperature	actual_range	float	17.2791, 24.9401
attribute	Temperature	bcodmo_name	String	temperature
attribute	Temperature	description	String	Sea surface tempearture, measured with SBE45
attribute	Temperature	long_name	String	Temperature
attribute	Temperature	units	String	degrees Celsius (°C)
variable	Salinity		float
attribute	Salinity	_FillValue	float	NaN
attribute	Salinity	actual_range	float	0.208, 36.4
attribute	Salinity	bcodmo_name	String	sal
attribute	Salinity	colorBarMaximum	double	37.0
attribute	Salinity	colorBarMinimum	double	32.0
attribute	Salinity	description	String	Sea surface salinity, measured with SBE45
attribute	Salinity	long_name	String	Sea Water Practical Salinity
attribute	Salinity	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/PSALST01/
attribute	Salinity	units	String	PSU
variable	pCO2		double
attribute	pCO2	_FillValue	double	NaN
attribute	pCO2	actual_range	double	113.9379116, 1802.951313
attribute	pCO2	bcodmo_name	String	pCO2
attribute	pCO2	description	String	pCO2 at SST (+-2 uatm)
attribute	pCO2	long_name	String	P CO2
attribute	pCO2	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/PCO2C101/
attribute	pCO2	units	String	microatmosphere (uatm)
variable	Flag_pCO2		byte
attribute	Flag_pCO2	_FillValue	byte	127
attribute	Flag_pCO2	actual_range	byte	2, 2
attribute	Flag_pCO2	bcodmo_name	String	flag
attribute	Flag_pCO2	colorBarMaximum	double	150.0
attribute	Flag_pCO2	colorBarMinimum	double	0.0
attribute	Flag_pCO2	description	String	Flag of pCO2 at SST. A flag indicated as 2 is good, it means the precision is less than +- 2 uatm
attribute	Flag_pCO2	long_name	String	Flag P CO2
attribute	Flag_pCO2	units	String	unitless

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.